196 lines
6.4 KiB
Groff
Executable File
196 lines
6.4 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "BIO_NEW_CMS 3"
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.TH BIO_NEW_CMS 3 "2020-03-02" "1.1.1e-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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BIO_new_CMS \- CMS streaming filter BIO
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/cms.h>
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\&
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\& BIO *BIO_new_CMS(BIO *out, CMS_ContentInfo *cms);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIBIO_new_CMS()\fR returns a streaming filter \s-1BIO\s0 chain based on \fBcms\fR. The output
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of the filter is written to \fBout\fR. Any data written to the chain is
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automatically translated to a \s-1BER\s0 format \s-1CMS\s0 structure of the appropriate type.
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.SH "NOTES"
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.IX Header "NOTES"
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The chain returned by this function behaves like a standard filter \s-1BIO\s0. It
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supports non blocking I/O. Content is processed and streamed on the fly and not
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all held in memory at once: so it is possible to encode very large structures.
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After all content has been written through the chain \fIBIO_flush()\fR must be called
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to finalise the structure.
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.PP
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The \fB\s-1CMS_STREAM\s0\fR flag must be included in the corresponding \fBflags\fR
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parameter of the \fBcms\fR creation function.
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.PP
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If an application wishes to write additional data to \fBout\fR BIOs should be
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removed from the chain using \fIBIO_pop()\fR and freed with \fIBIO_free()\fR until \fBout\fR
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is reached. If no additional data needs to be written \fIBIO_free_all()\fR can be
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called to free up the whole chain.
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.PP
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Any content written through the filter is used verbatim: no canonical
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translation is performed.
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.PP
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It is possible to chain multiple BIOs to, for example, create a triple wrapped
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signed, enveloped, signed structure. In this case it is the applications
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responsibility to set the inner content type of any outer CMS_ContentInfo
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structures.
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.PP
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Large numbers of small writes through the chain should be avoided as this will
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produce an output consisting of lots of \s-1OCTET\s0 \s-1STRING\s0 structures. Prepending
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a \fIBIO_f_buffer()\fR buffering \s-1BIO\s0 will prevent this.
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.SH "BUGS"
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.IX Header "BUGS"
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There is currently no corresponding inverse \s-1BIO:\s0 i.e. one which can decode
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a \s-1CMS\s0 structure on the fly.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIBIO_new_CMS()\fR returns a \s-1BIO\s0 chain when successful or \s-1NULL\s0 if an error
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occurred. The error can be obtained from \fIERR_get_error\fR\|(3).
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIERR_get_error\fR\|(3), \fICMS_sign\fR\|(3),
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\&\fICMS_encrypt\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The \fIBIO_new_CMS()\fR function was added in OpenSSL 1.0.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2008\-2016 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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